There's nothing quite like a sudden Google algorithm update to leave marketers feeling equal parts confused and concerned. It seems like they wait for you to get all of your ducks in a row and then unleash an update that makes your efforts instantly obsolete.
Sure, they're pretty open about that fact that they're doing this for everyone's own good -- each algorithm tweak brings us one step closer to more relevant search results, after all. However, there is still some secrecy behind exactly how Google evaluates a website and ultimately determines which sites to show for which search queries.
That said, there are a number of tools out there -- some free, some paid -- that help you to look at your own site the way that Google sees it.